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Please explain to me how Bolt Card does not let the first merchant you use it with to drain the balance of the entire card?
Those cards are not just simple NFC LNURL-w links. It contain a security tag embedded. Even that the shop could grab the LNURL-w somehow, it still needs the security code to authorize the withdrawal. Read more here: https://www.nxp.com/docs/en/application-note/AN12196.pdf
Here more explanations about how to make your own cards with LNbits, BTCpay, BoltcardHub etc https://plebtag.com/write-tags/
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